locked."

"Hum, that's funny!" said Bunny Brown.

"How do you s'pose that dog got out with both doors locked?" asked Sue of her brother.

Bunny paused to think. Then an idea came to him.

"He must have jumped out a window, that dog did," he said. "There must be a window open, and he got out that way. And that's how we can get out, Sue. We'll crawl out a window just like that dog jumped out. Now we're all right. Mr. Foswick locked us in his carpenter shop by mistake, but we can get out a window."

"Oh, yes!" agreed Sue, and she felt happier now.

But again came disappointment. When the children made the rounds of the shop, looking on both sides, they not only saw that not a window was open, but when Bunny tried to raise one he could not.

"Are they stuck?" asked Sue.

"No," replied Bunny. "They're nailed shut! Every window in this shop is nailed shut, Sue, and the doors are both locked!"

"Oh!" exclaimed Sue in a faint voice, and she looked at her brother in a way he felt sure meant she was going to cry.

CHAPTER III

THE DIAMOND RING

Whistling as cheerfully as he could, Bunny Brown glanced all around the carpenter shop.

"Are you whistling for the dog?" asked Sue.

"No, not zactly," Bunny answered. "I'm just whistlin' for myself. I'm going to do something."

"What?" asked Sue.

She knew that whenever Bunny was making anything, such as a boat out of a piece of wood or a sidewalk scooter from an old roller skate, he always whistled. The more he worked the louder he whistled.

"What are you going to make now?" asked Sue.

"Oh, I'm not going zactly to make anything," Bunny explained. "I'm just going to do something. I'm going to open one of these windows so we can get out, same as the dog did."

"But he didn't get out of a window," objected Sue. "How could he, if they were nailed shut before we came in? And they must 'a' been, 'cause we didn't hear Mr. Foswick hammering."

"Yes, I guess the windows have been nailed shut maybe a long time," agreed Bunny. "But, anyhow, the dog got out and we can get out."

"But how could he get out if both doors are locked and the windows nailed shut?" Sue wanted to know.

Bunny could not answer that. Besides, he had other things to look after. He wanted to get himself and his sister out of the carpenter shop before Sue began to cry. Bunny didn't like crying girls, even his sister, though he felt sorry for them.

"I can take a hammer and pull the nails out of a window where it's nailed shut, and then I can raise it and we can crawl out," explained Bunny to his sister. "There's sure to be a hammer in a carpenter shop."

There were, several of them, lying around on the benches and sawhorses that seemed to fill the place. There were other tools, also; sharp chisels and planes, but Bunny and Sue knew enough not to touch these. The children might have been cut if they had handled the sharp tools. Mr. Brown kept sharp tools at his dock for mending old boats and making new ones, so Bunny and his sister knew something about carpentry.

"I guess this hammer will be a good one," said Bunny, picking up one with a claw on the end for pulling out nails. He had often seen Bunker Blue at the boat dock use just such a hammer as this.

Bunny climbed up on a workbench near a window which, as he could look out and see, was only a short distance from the ground. If that window could be opened, the little boy and his sister could easily drop out and not be hurt in the least.

"Can you get it open?" asked Sue anxiously, as she watched Bunny climb upon the dusty carpenter bench.

"Oh, sure!" he answered. "We'll be out in a little while now; and then we can go and hunt that big dog that has our mother's pocketbook."

"And the money, too," added Sue. "We've got to get the money and go to the store, Bunny."

"Yes, that's right," he agreed.

With the hammer in his hand, he began looking over the window. He wanted to see where the heads of the nails were sticking out, so he could slip the claw of the hammer under them and pull them out by prying on the handle. Bunny had not only pulled out nails himself before this, but he had watched his father and Bunker Blue do it.

Bunny Brown also knew how windows were nailed shut. Once the Browns owned a little cottage on an island in the river. They sometimes spent their summer vacations in the cottage, and in the fall, when winter was approaching and the cottage was to be closed, the windows were nailed shut from the inside.

Once Bunny had helped his father nail the windows shut, and once he had helped pull the nails out the next summer when the cottage was to be opened. So Bunny was now looking for the heads of nails in the window of Mr. Foswick's carpenter shop.

The first window he looked at was so tightly nailed, with all the heads driven so far into the wood, that Bunny could get the claw of the hammer under none of them. He made his way along the bench to the next window. This window was nearer the street.

"Can you open that one?" asked Sue.

"Yes, I guess so!" exclaimed Bunny.

The little boy saw a nail head sticking out. He slipped the claw of the hammer under it and pressed hard on the handle.

Whether Bunny had not put the claw far enough under the nail, or whether the head was so small that the claw slipped off, neither of the children knew. But what happened was that Bunny's hand slipped, the hammer also slipped away from his grasp, and the next moment, with a crash and tinkle of glass, the hammer broke through the window and fell outside.

"Oh, Bunny! are you hurt?" cried Sue, for once she had seen her mother cut her hand trying to open a window that stuck.

"No, I'm not hurt," answered her brother. "But the hammer's gone out."

"You can get another. There's lots here," said Sue.

"But I can't fix the window," said Bunny, rather sadly. "It's all busted!"

"It wasn't your fault!" said Sue stormily. "Mr. Foswick ought never to have locked us in, and then you wouldn't have to try to unnail a window to get out! It's his fault!"

"Maybe it is," said Bunny, leaning forward to look out of the broken window.

"Don't try to crawl out!" exclaimed Sue. "You might get cut!"

"I'm not going to," said Bunny. "I was just seeing how far it was and where the hammer went. It's on the grass, and it isn't far out of the window at all. If we could only crawl out——"

"And get all cut on the glass? I guess not!" cried Sue. "Oh, Bunny!" she suddenly exclaimed. "Look! There goes Mr. Reinberg, who keeps the drygoods store. Call to him through the broken window, and he'll get us out!"

Through the window, which he had broken with the hammer, Bunny had a glimpse of the street. As Sue had said, the drygoods merchant was just then passing.

"Hi!" suddenly called Bunny. "Let us out, please! Help us out, Mr. Reinberg!"

The merchant looked up, down, and sideways. He could not at first tell where the voice was coming from.

"Who are you and where are you?" he demanded.

"I'm Bunny Brown, and my sister Sue is with me," came the answer from the little boy. "And we're locked in Mr. Foswick's carpenter shop."

"Oh, now I see you!" said the drygoods store man, glancing toward Bunny, who could be seen through the window. "So you're locked in, are you? How did it happen?"

"Mr. Foswick locked us in," said Bunny.

"He did! What for?"

"Oh, I guess he thought